How do you fly on a world with no atmosphere? Wings won't work and neither do propellers. The space agency is perfecting the art of "airless flying" using a prototype lunar lander at the Marshall Space Flight Center.

The longest solar eclipse of the 21st century takes place this Wednesday, July 22nd. The path of totality crosses many major cities, setting the stage for possibly the best-observed eclipse in human history.

Imagine cutting retractable doors in the side of a 747 airliner, installing a 17-ton telescope, and flying to the stratosphere to solve one of astronomy's greatest puzzles. That's what NASA and the German Aerospace Center plan to do with a cutting-edge airborne observatory named SOFIA.

The planets Venus and Jupiterwill pass less than 42 arcseconds apart on May 17. Because the pair is so near to the Sun, only the Solar and Heliospheric Observatory will have a good view of the close encounter, which is similar to the

NASA scientists have discovered unexpected spiral-shaped flames on Earth. By studying these peculiar flames, researchers hope to mitigate fire hazards on spacecraft and gain new insights about complex systems in nature.